Population mean on quantitative portion of GRE between 1994 and 1997 was 558 (o =139). Select sample of 100 participants. Record the sample mean to equal 585.

1. Conduct a two-tailed (nondirectional) z test for whether or not we will retain the population mean stated by the null at a 0.05 level of significance, using zcrit and zobt.  

2. Compute Cohen's d.

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